Before
you deploy OCS 2007, you need to have one or more hardware load balancers ready, in
place, and confi gured appropriately. Again, we??™re not just talking about the primary servers
but everything down to the edge servers.
Planning for VoIP is the eighth phase. This is a different type of consideration in that you
must consider the impact on both your telephony and IP infrastructures. The one thing you
won??™t have to consider here, though, is replacing your existing PBX.
Considerations you??™ll want to evaluate include:
?– How many and where are your users?
?– What deployment best suits your organization?
?– How many media gateways are needed and where should they be located
in your organization?
?– What are the routing rules and user privileges for your Enterprise Voice
deployment?
?– Carefully develop your plan for call notifi cation, voice mail, and other call services
provided by Exchange UM.
?– How will you migrate your users to Enterprise Voice?
The ninth phase in the planning process is to plan for the Address Book Server. Remember,
the main reason the Address Book Server exists is to provide global address list information
60 Chapter 2 ??? Microsoft Offi ce Communications Server 2007
from Active Directory to the MOC 2007 client. If Communicator accessed Active Directory
directly, it would affect your network performance. The Address Book Server is installed on
every Front-End Server.
The tenth phase is to plan for high availability and fault tolerance.
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